Nothing particularly exciting except it moved all my custom maps/campaigns into the Documents folder.

Although fair warning: The patch puts a plain text file in your Warcraft III folder containing your CD keys for Roc and TFT. Make sure you register them on your Blizzard account because that's kind of a weird thing to do.

Yeah seems like I'm the only one who had absolutely no problems that I'm aware of. It hung for a LONG time because of moving my campaign files, but it moved them nonetheless (all except the Demo Campaign even when I moved IT into a few subtrees).